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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32280cf73d3b9b1452f90f1e63774fbdae4818216635860281f8d54cc0bd1b28' 
  AND token = 'jSFujjlepelqCtBFPYq76KGMSu93iiglxa8bjaES8w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}